Dead Play:5 need schematics or tips

How mich W must have the resistor or doesnt care?

maybe 0.1w or below，i guess

Hello, thanks for the picture.

I have-it fixed finally but I do not know the cause. Here it is in words and pictures:

First, small cap (C27854) is not charging from the AC side, those are probably discharge resistors to the remaining capacity in the filtering caps. It’s another mechanism I could not figure out. The C27854 is providing power to the ICE2QS02 driver chip. It goes thru all those small diodes and caps on the edge of the board. The normal behavior on the voltage for C27854 is that is charging up to around 20V slowly and then ( some of those diodes and transistors do that) turns on the power on the ICE2QS02. 

Once the chip is starting the voltage is self sustaining to around 13 V, I do not understand from where, maybe from the fly back transformer winding itself. 

So for me the challenge was to produce the charging of the C27854 up to 20 to start up the IC. I did this by putting 2 390Kohm from the + on the big caps. I monitor the voltage and it’s ramping up slow, like a second or two. After it reaches 20V the IC starts and it self sustain to 13V. It’s 3 days already and still works! meaning there is no other fail. There was no problem in the fuse or rectifier, nothing burned. As you can see the LED turns on with the 2 resistors soldered. This is the story of this fix.

 

I have no power on pin 7 on ICE2QS02 and when i measure on C27854 it goes from 9 to 18 VDC in a 2-3 second loop, is this the same behaviour as you had?

i have the same problem, pin7 no power(0.1 or 0.5v), c27854 get loop vdc,have you fixed the problem by use putting 2 390Kohm from the + on the big caps?

Hello, thanks for the picture.

I have-it fixed finally but I do not know the cause. Here it is in words and pictures:

First, small cap (C27854) is not charging from the AC side, those are probably discharge resistors to the remaining capacity in the filtering caps. It’s another mechanism I could not figure out. The C27854 is providing power to the ICE2QS02 driver chip. It goes thru all those small diodes and caps on the edge of the board. The normal behavior on the voltage for C27854 is that is charging up to around 20V slowly and then ( some of those diodes and transistors do that) turns on the power on the ICE2QS02. 

Once the chip is starting the voltage is self sustaining to around 13 V, I do not understand from where, maybe from the fly back transformer winding itself. 

So for me the challenge was to produce the charging of the C27854 up to 20 to start up the IC. I did this by putting 2 390Kohm from the + on the big caps. I monitor the voltage and it’s ramping up slow, like a second or two. After it reaches 20V the IC starts and it self sustain to 13V. It’s 3 days already and still works! meaning there is no other fail. There was no problem in the fuse or rectifier, nothing burned. As you can see the LED turns on with the 2 resistors soldered. This is the story of this fix.

 

I have no power on pin 7 on ICE2QS02 and when i measure on C27854 it goes from 9 to 18 VDC in a 2-3 second loop, is this the same behaviour as you had?

a normal board ,the C27854 is 15VDC, the pin 7 on ice2qs02 is 1.5 VDC

Does it matter, how mich V the capacitor must have? And maybe means, i cannot  measur up an SMD capacitor ?

And can someone tell me, what size of smd resistors they are, I can't measure up this size

I’ve just been repairing one of these, using many of the tips here.  Some observations for those following in the footsteps of many:

I had a blown fuse, then needed to track down what else was faulty.  Replaced fuse with same type. I thought the DC measurements were suggesting a problem with the MOSFET switch, so I changed that out with another N-Channel of similar value I had on hand.  The Dim Bulb Tester indicated there was still something wrong, but interestingly I was getting some useful DC voltages. My DC measurements of the bridge rectifier didn’t suggest it was faulty, so I pressed on. Decided to try plugging directly in to the mains. Big mistake. Loud explosion as the fuse self-destructed.
So stepping back I decided to use a process of elimination.  I removed both 100uF charge capacitors.  Replaced fuse, connected Dim Bulb Tester, still showed excess current.  I then removed the bride rectifier and replaced with another I had on hand.  Success: no more large current drain.
I intend changing out the 100UF caps with high quality brand, as well as the electro caps on the cold side.

But this failure of the bridge rectifier is a weird one.  I fix Switched Mode Power Supplies a fair bit.  Bridge rectifiers either go short or open circuit.  It’s as if this is failing under mains voltage?
Anyway, that bridge rectifier is a bugger to get out.  Removing the two 100uF caps gave better access to be able leverage it out whilst hitting it with the soldering iron (after having previously used a desoldering gun on those terminals).

So what does it mean "maybe"? Can't I measure up an SMD capacitor or what?

For what it’s worth, I tried measuring these in circuit with my Fluke 87V.  I got 0 for C27852, and 2.0nF for C27855.  I imagine that the 0nF reading is due to the measurement being done in circuit.

Anything with this low a capacitance is going to be a filter cap, and I’m pretty sure you can just go with a low value (or maybe even no capacitor) and it would be fine.  I had a look at the eval board application note, and I don’t even see these caps in that circuit diagram https://www.infineon.com/dgdl/Infineon-ApplicationNote_EvaluationBoard_80W_SMPS_QR_PWM_Controller_ICE2QS02G%20-AN-v01_00-EN.pdf?fileId=db3a30431a5c32f2011abefae1533bcd

Ok I understand. So you mean that I could only use one capacitor with 2 or 3nf instead of the 2 SMD capacitors?